Zadanie 16
Which pair of changes both involve an increase in entropy? A. N2(g) + 3 H2(g) → 2 NH3(g) and H2O(l) → H2O(s) B. CaCO3(s) → CaO(s) + CO2(g) and CO2(g) → CO2(s) C. Ag+(aq) + Cl−(aq) → AgCl(s) and…
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Which pair of changes both involve an increase in entropy? A. N2(g) + 3 H2(g) → 2 NH3(g) and H2O(l) → H2O(s) B. CaCO3(s) → CaO(s) + CO2(g) and CO2(g) → CO2(s) C. Ag+(aq) + Cl−(aq) → AgCl(s) and…
Methane, the main component of natural gas, burns in a domestic boiler. State the main form of energy released directly by the combustion reaction.
Hexane is a component of petrol. The equation for its combustion is: Determine the mass of carbon dioxide, in g, released for every 1 kJ of energy produced by the combustion of hexane. Use section 14 of the data…
Which combination of the signs of ΔH⊖ and ΔS⊖ describes a reaction that is spontaneous only at low temperature? The options list the sign of ΔH⊖ first. A. positive, positive B. positive, negative C. negative,…
Calcium carbonate and magnesium hydroxide are two antacids. Write an equation for the reaction of each antacid with excess hydrochloric acid in the stomach. Calcium carbonate: Magnesium hydroxide:
One antacid tablet contains 1.50 g of calcium carbonate and a second tablet contains 1.50 g of magnesium hydroxide. Show by calculation that the tablet of magnesium hydroxide would neutralize more hydrochloric acid than the tablet of calcium carbonate.
A reversible reaction in a closed vessel at constant temperature and pressure has reached equilibrium. Which statement is correct? A. The change in Gibbs energy, ΔG, is zero B. The standard change in Gibbs energy, ΔG⊖, is zero C.…
The temperature of a sample of gas is raised from 27 °C to 177 °C. By what factor does the average kinetic energy of the gas particles change? A. 1.2 B. 1.5 C. 2.25 D. 6.6
Curve X (dashed) shows the volume of oxygen formed when 25 cm3 of 1.0 mol dm−3 hydrogen peroxide solution decomposes in the presence of a manganese(IV) oxide catalyst at 25 °C. 2 H2O2(aq) → O2(g) + 2 H2O(l) Which change would…
The graph shows how the concentration of reactant A changes during a reaction. The dashed line is the tangent to the curve at t = 0. Which calculation gives the initial rate of reaction, in mol dm−3 s−1? A. B.…